/*
 * Copyright 2009 Red Hat, Inc.
 *
 * Red Hat licenses this file to you under the Apache License, version 2.0
 * (the "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at:
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package com.xiaonei.netty.hello;

import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelPipelineCoverage;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelUpstreamHandler;

/**
 * Handler implementation for the echo client. It initiates the ping-pong
 * traffic between the echo client and server by sending the first message
 * to the server.
 * 
 * @author The Netty Project (netty-dev@lists.jboss.org)
 * @author Trustin Lee (tlee@redhat.com)
 * 
 * @version $Rev: 1711 $, $Date: 2009-09-04 12:01:58 +0900 (금, 04 9 2009) $
 */
@ChannelPipelineCoverage("all")
public class HelloClientHandler extends SimpleChannelUpstreamHandler {

    private static final Logger logger = Logger.getLogger(HelloClientHandler.class.getName());

    private final ChannelBuffer firstMessage;

    private final AtomicLong transferredBytes = new AtomicLong();

    /**
     * Creates a client-side handler.
     */
    public HelloClientHandler(int firstMessageSize) {
        if (firstMessageSize <= 0) {
            throw new IllegalArgumentException("firstMessageSize: " + firstMessageSize);
        }
        firstMessage = ChannelBuffers.buffer(firstMessageSize);
        for (int i = 0; i < firstMessage.capacity(); i++) {
            firstMessage.writeByte((byte) i);
        }
    }

    public long getTransferredBytes() {
        return transferredBytes.get();
    }

    @Override
    public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) {
        // Send the first message.  Server will not send anything here
        // because the firstMessage's capacity is 0.
        e.getChannel().write(firstMessage);
    }

    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
        // Send back the received message to the remote peer.
        transferredBytes.addAndGet(((ChannelBuffer) e.getMessage()).readableBytes());
        e.getChannel().write(e.getMessage());
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
        // Close the connection when an exception is raised.
        logger.log(Level.WARNING, "Unexpected exception from downstream.", e.getCause());
        e.getChannel().close();
    }
}
